Confession time straight off; I installed an nVidia Geforce GTX 650Ti Boost, and that appears to be whats causing the problem. My problem is I don't know how to adjust the settings so it will again... Previous graphics was on-board, only way to get decent FPS was at minimun settings... Any ideas?

I have since found a fix (although it has stopped working again -.- If you go to <Your steam folder>\SteamApps\common\Grid\system\hardware_settings_restrictions.xmlYou will see at the bottom, there is a restriction on the graphics resolution.... Its the very last restricion setting. Delete that, and it will work. I wish I could give you more info, but I didn't bookmark the page. Thought I was alone in the problem.